Question

What are the stages of sleep?

Answer 1

When you're asleep, you cycle between REM and non-REM sleep.

REM stands for rapid eye movement. During REM sleep, your eyes move quickly in different directions. That doesn't happen during non-REM sleep.

First comes non-REM sleep, followed by a shorter period of REM sleep, and then the cycle starts over again. Dreams typically happen during REM sleep.